There are several calls to check if extensions like extbase are loaded.
As those extensions cannot be removed and are always loaded,
the code can be removed.

Resolves: #56858
Releases: 6.2
Change-Id: I434daaa2e5ae98ac623e8c9c06a0cb41560d3610
Reviewed-on: https://review.typo3.org/28335
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Neufeind
Reviewed-by: Oliver Klee
Tested-by: Stefan Neufeind
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer